- CREST-Accredited Company
- Penetration Testing
- United Kingdom
Penetration Testing Services in the UK
CREST-accredited penetration testing for UK firms that must satisfy regulators, auditors and enterprise customers
People Find the Flaws. AI Helps Them Find More, Faster.
UK organisations call ISECURION when a regulator, a customer or an auditor wants proof that their systems can survive a real attack. We test web applications, APIs, mobile apps, cloud estates and networks, then give your engineers findings they can reproduce and fix.
Our testers work by hand, supported by tooling and AI, so results reflect how an attacker would really behave instead of what a scanner can list. ISECURION is a CREST-accredited company for penetration testing, which gives your procurement and risk teams an independent credential to verify. See the wider VAPT services.
What UK clients usually ask us for:
- Pre-launch testing of customer-facing apps and APIs
- Evidence for FCA, PRA, ICO and PCI DSS conversations
- Cloud and infrastructure testing before audits or renewals
- Supplier assurance for enterprise and public sector buyers
- Security testing of AI features and MCP servers
- Retesting to confirm that fixes really work
ISECURION delivers from Bengaluru and works with UK clients remotely. Scope, working hours, data handling and any cross-border transfer terms are fixed in writing before testing begins.
Request a Penetration Testing Proposal
Tell us what you need tested. We reply within one working day.
What Is Penetration Testing, and Why Do UK Organisations Need It?
A penetration test is a permissioned attack on your own systems. Testers behave like a capable adversary: they probe applications, networks, cloud accounts and sometimes staff, then record every route that worked and what it exposed. You receive proof, not speculation.
The UK has no single law that says every organisation must run penetration tests, but the pressure is real and comes from several directions. UK GDPR expects appropriate technical and organisational measures to protect personal data. Regulated firms answer to the FCA and PRA on operational resilience. Operators of essential services follow the NIS Regulations. Card-handling businesses follow PCI DSS, and enterprise and public sector customers ask for independent test reports and Cyber Essentials Plus evidence in procurement.
That is why a clean vulnerability scan rarely settles an auditor's question. Scans report known issues. They do not show which ones chain together, which ones the business cannot tolerate, or how a flaw in your own logic could be abused. Human-led penetration testing answers those questions.
Why Choose a CREST-Accredited Penetration Testing Company?
CREST was founded in the UK to raise testing standards, and it assesses firms on process, data handling and tester skill. ISECURION is CREST accredited for penetration testing, so UK buyers can confirm our status with CREST directly.
What You Can Rely On
- Third-party assessment - how we plan, run and report tests has been reviewed independently
- A stated scope - our accreditation is for penetration testing, described exactly as approved
- A credential you can check - verify our status with CREST instead of trusting a brochure
- Reviewed reports - every report gets a technical review before it reaches you
- See before you buy - ask for a sanitised sample report
Which Penetration Test Fits Your Situation?
Most UK buyers do not start with a test type. They start with a problem: a launch, a contract, a regulator or an audit. Use this table to see what usually solves it.
| Your situation | Testing that usually fits | Why it helps |
|---|---|---|
| Launching an app that holds UK personal data | Web, mobile and API testing, grey box | Shows security measures were tested before customers arrived |
| Bidding for enterprise or public sector work | Scoped application and infrastructure test; Cyber Essentials Plus pre-assessment | Gives buyers an independent report and a smoother technical verification |
| FCA or PRA firm evidencing impact tolerances | Scenario-based attack testing of important business services, plus retest | Supplies evidence for the self-assessment and board reporting |
| Taking card payments | PCI DSS-related application and segmentation testing | Meets annual and change-driven testing expectations |
| Moving to AWS, Azure or Google Cloud | Cloud configuration and identity review with exploitation attempts | Finds exposed storage, over-privileged roles and leaked secrets |
| Recovering from an incident or acquiring a company | Validation test of affected systems, or due diligence testing | Confirms the weakness is closed or the risk is known |
| Building with LLMs or AI agents | AI and MCP security testing | Tests prompt injection, tool abuse and data leakage |
| Strong basics, want to test detection | Red team or adversarial simulation | Shows whether monitoring and response catch a determined attacker |
What We Test
Web applications and APIs
Authentication, access control, business logic and injection across REST, GraphQL and SOAP services.
Mobile apps
iOS and Android apps measured against OWASP MASVS, including local storage, transport and backend calls.
Networks and wireless
Internet-facing hosts, internal networks, Active Directory and Wi-Fi tested for a way in and a way across.
Cloud environments
Identity, storage, network exposure and misconfiguration across AWS, Azure and Google Cloud.
Thick clients
Desktop and trading clients checked for insecure local data, weak updates and misplaced client-side trust.
Source code
Secure code review for design and logic flaws that black-box testing can miss.
Adversary simulation
Goal-led red team exercises that test detection and response across people, process and technology.
How Much Do You Tell Us Up Front?
| Approach | What you provide | Best used for |
|---|---|---|
| Black box | Nothing beyond the target | Seeing what an anonymous outsider can reach |
| Grey box | Test accounts and API documentation | Most applications, because time goes on real flaws, not guesswork |
| White box | Architecture detail and source code | Critical financial systems and product security sign-off |
Questions to Ask Any UK Penetration Testing Supplier
- Which accreditation do you hold, and what is its exact scope? Then check it with the issuing body.
- Who will actually test my systems? Ask about qualifications and how much of the work is manual.
- Can I see a sanitised report? Look for evidence, reproduction steps and business impact.
- Is retesting included? Proof of closure is what auditors want.
- Where will my data go? Insist on written terms for storage, transfer and deletion.
- Does my contract need a specific scheme? Some public sector and infrastructure work does.
Not sure where to start?
Describe your systems and the deadline you are working to. An engineer will suggest a sensible scope.
What a Typical UK Engagement Looks Like
The timings below illustrate a focused web application and API test. Larger programmes take longer, and we confirm dates in the proposal.
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Before day one: scope and authorisation
We agree targets, test accounts, testing windows, escalation contacts and data handling, and you sign written authorisation covering the work.
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Days 1 to 2: discovery
Testers map endpoints, roles, technologies and trust boundaries, then plan attack paths around the features that matter most to your business.
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Days 3 to 8: active testing
Manual testing and tooling run side by side. Anything critical is raised with you immediately instead of waiting for the report.
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Days 9 to 10: analysis and reporting
Findings are validated, rated with CVSS in your business context, and written up with evidence, reproduction steps and fixes. A second tester reviews the report.
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After delivery: walkthrough and retest
We walk your engineers through each finding, support remediation questions, and retest fixes so the final report shows what is closed.
How We Use AI in Penetration Testing
AI shortens the repetitive parts of a test, which leaves more of the engagement for the creative work that finds serious flaws. A tester always makes the final call.
| Stage of the test | Where AI helps | What the tester does |
|---|---|---|
| Mapping the target | Speeds up discovery of endpoints, parameters and technologies | Decides what is in scope and which areas deserve depth |
| Sorting results | Groups related scanner output and suggests test cases | Removes false positives and verifies every finding by hand |
| Finding attack paths | Proposes ways small weaknesses might combine | Proves or disproves each path with controlled exploitation |
| Writing up | Drafts evidence notes and fix guidance | Edits, corrects and signs off the report |
UK Cybersecurity & Data Protection Frameworks Explained
UK obligations come from data protection law, sector regulators, the NCSC and industry standards, and which ones bind you depends on your sector and the data you hold. Map them once to a single control set and testing plan instead of running a separate project for each.
UK GDPR and Data Protection Act 2018
Scope: Any organisation that processes personal data of people in the UK
Administered by: Information Commissioner's Office (ICO)
Key expectations: Appropriate technical and organisational security measures, regular testing of their effectiveness, and breach notification to the ICO
How we help: We test the systems that hold personal data and keep records showing your safeguards work.
NIS Regulations 2018
Scope: Operators of essential services and relevant digital service providers
Administered by: Sector regulators and the ICO
Key expectations: Appropriate and proportionate security measures, incident notification and cooperation with the regulator
How we help: Independent testing and assurance for networks and systems that support essential services.
FCA and PRA operational resilience
Scope: Banks, building societies, insurers, investment firms and other in-scope financial firms
Administered by: Financial Conduct Authority and Prudential Regulation Authority
Key expectations: Identify important business services, set impact tolerances and test that you can stay within them in severe but plausible scenarios
How we help: Penetration testing and attack scenarios that provide evidence for your self-assessment and board reporting.
PCI DSS
Scope: Any business that stores, processes or transmits cardholder data, including merchants and payment providers
Administered by: PCI Security Standards Council, enforced through card brands and acquirers
Key expectations: Regular penetration testing, segmentation validation and vulnerability management
How we help: PCI DSS-related testing with reports mapped to the requirements your assessor will review.
Cyber Essentials and Cyber Essentials Plus
Scope: UK organisations seeking a government-backed baseline, often required in public sector supply chains
Administered by: NCSC scheme delivered through accreditation bodies and certifiers
Key expectations: Five technical control themes, with hands-on technical verification at the Plus level
How we help: Pre-assessment testing so you reach certification faster and with fewer surprises.
NCSC CHECK, CBEST and similar schemes
Scope: Government, some national infrastructure and firms selected by financial regulators
Administered by: NCSC and the Bank of England
Key expectations: Testing delivered under scheme-specific rules, usually by approved or accredited providers
How we help: We explain which scheme your work needs, confirm in writing what we can deliver, and work with approved partners where required.
Framework Comparison Matrix
| Framework | Applies to | Incident reporting | Testing expectation |
|---|---|---|---|
| UK GDPR and DPA 2018 | Organisations processing personal data | ICO within 72 hours of becoming aware of a notifiable breach, where feasible | Regular testing of security measures |
| NIS Regulations | Operators of essential services; digital service providers | Notify the relevant regulator under the regulations; stricter windows proposed | Appropriate and proportionate measures |
| FCA and PRA resilience | In-scope financial firms | Prompt notification to regulators in line with their rules | Scenario testing, including penetration tests |
| PCI DSS | Card data environments | Per card brand and acquirer rules | Annual and after significant change |
| Cyber Essentials Plus | Organisations seeking certification | Not applicable | Hands-on technical verification |
Incident & Breach Reporting Timelines in the UK
Who you must tell, and how fast, depends on your regulator and sector, and the clocks start at different moments. Use the cards as orientation and check the current wording before relying on it.
UK GDPR personal data breach
Window: to the ICO without undue delay and, where feasible, within 72 hours of becoming aware
Threshold: unless the breach is unlikely to result in a risk to individuals
Individuals: told without undue delay where the risk to them is high
Key point: the 72 hours runs from awareness, so detection speed matters.
NIS essential services
Window: set by the NIS Regulations and your sector regulator
Recipient: the relevant competent authority
Applies to: operators of essential services and certain digital service providers
Key point: reform is proposed, so watch for changes.
Financial services firms
Window: prompt notification under FCA and PRA rules
Recipient: FCA and PRA
Also: operational resilience self-assessment and testing evidence
Key point: keep incident, tolerance and test records ready for supervisors.
Payment card incidents
Window: defined in your acquirer agreement and card brand rules
Recipient: your acquirer, the card brands and, where required, a forensic investigator
Key point: PCI DSS also expects preserved evidence and a working incident response plan.
On the horizon: the Cyber Security and Resilience Bill
The Cyber Security and Resilience Bill is moving through Parliament and proposes to widen the NIS regime, bring in managed service providers and data centres, and require an initial incident notification within 24 hours and a fuller report within 72 hours for significant incidents. Substantive duties depend on later secondary legislation, so check the Bill's current status before you plan around it.
Example: A Fintech Suffers an API Breach
- Immediately: contain the incident, preserve evidence and start the breach assessment
- Within 72 hours of awareness: report to the ICO if the breach is notifiable
- In parallel: inform your regulators, acquirer and affected customers as required
- Later: targeted testing and a retest confirm the weakness is closed
Who We Test For in the UK
We work directly with regulated and fast-growing UK organisations, and behind the scenes with firms that resell security services.
Regulators expect firms to withstand severe but plausible disruption. We build tests around your important business services and the systems behind them.
- Scenario-style attack testing of payment, onboarding and trading journeys
- Evidence formatted for your operational resilience self-assessment
- Third-party and API exposure checks
- Retests that close findings before supervisory reviews
Enterprise customers send long security questionnaires and ask for recent test reports. A well-scoped annual test shortens those deals.
- Multi-tenant isolation and authorisation checks
- Tests of AI features, LLM integrations and MCP servers
- CI/CD pipeline and secrets review
- Reports you can share under NDA with prospects
Checkout abuse, account takeover and downtime in peak trading are the risks that cost money fastest.
- Basket, discount and payment logic abuse testing
- Account takeover and credential stuffing resilience
- Mobile app testing against OWASP MASVS
- PCI DSS-related segmentation checks
If you sell security or IT services but lack testing capacity, we can work behind your brand.
- Reports to your template, where agreed
- Extra testers for busy periods
- One named project lead
- Scheme and licensing requirements confirmed in writing before work starts
What UK Buyers and Regulators Ask For
Whether the request comes from a customer, an auditor or a supervisor, it tends to be the same handful of questions. This is how we answer them.
| They ask | What you hold after working with us |
|---|---|
| Show us a recent independent test | An executive summary and technical report from a CREST-accredited company |
| Prove the issues were fixed | A retest report listing each finding as open or closed |
| How is our data handled? | Signed rules of engagement with data handling and transfer terms |
| Can you tie findings to our framework? | Findings referenced to UK GDPR, PCI DSS, Cyber Essentials Plus or resilience evidence on request |
| Can the board follow it? | A plain-language summary of risk and priorities |
Areas Served
We serve organisations across the United Kingdom, including London, the South East, Manchester and the North West, Birmingham and the Midlands, Edinburgh and Glasgow in Scotland, Leeds, Bristol, Cambridge, Belfast and Cardiff. Testing is delivered remotely, and we can join board sessions, workshops and tabletop exercises online or in person where needed.
Frequently Asked Questions: Penetration Testing in the UK
1. What does CREST accreditation tell me about a UK penetration testing provider?
2. Is penetration testing a legal requirement in the UK?
3. What is the difference between CREST and CHECK?
4. Can ISECURION deliver work that requires NCSC CHECK?
5. How fast must a UK organisation report a cyber incident or data breach?
6. Do the FCA and PRA expect penetration testing?
7. How long does a penetration test take, and how is it priced?
8. You are based in India. How do you handle UK data and working hours?
9. Can you deliver testing for UK consultancies and MSPs under their own brand?
Get a UK Penetration Test Scoped This Week
CREST accredited for penetration testing, CERT-In empanelled and ISO 27001:2022 certified. Tell us what you run and what you must prove, and we will propose a plan.
